Red gills-neon tetras help

I have been struggling with high ammonia and nitrates recently,because of decaying plants I suspect-have removed them and perform small but gradual water changes. One of my neon tetras seems to have very red gills and it looks really painful, will not be able to perform a water change for another 16 hours A) what can I do ??? B) will this fish survive??? P.s all other fish seem not to be affected in a similar way